Propeller



` l 635 966 July l2 1927. H' G. STANTON v .PROPELLER Filed Auz. 14. 1926 2 Sheets-Sheet 1 2.5 'Z- TTV za :n UI MS z 50 fi /3 53 l .56

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1,635,966 H. G. STANTON PROPELLER Filed Auz, 14.- 1926 f 2 Sheets-Shet 2 @Honing i PATENT OFFICE.

HARMON G. STANTON, OF GRAN D RAPIDS, MICHIGAN PBOPELLER.

-Applicationfiled. August 14, 1926. Serial No. 129,214.

This invention relates to propellers and more particularly to the construction of a ropeller in which the pitch of the blades 1s adjustable.

An important object of the invention is to produce a device of this character of such construction that the pitch of the blades may be readily varied 'during operation of the propeller to increase the-thrust thereof.

A further object of the invention is to improve the construction of., the propeller so as to render the blades rigid while at the same' time permitting such adjustment.

A still further object is to provide a novel and improved adjusting means /for the blades of the propeller.

These and other objects I attain by the construction shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein I Figure 1 is a frontv elevation partially in section showing a propeller constructed in accordance with my invention;

Figure 2 is a longitudinal sectional view showing -the manner of connecting the propeller with the control mechanism;

Figure 3 isa transverse sectional view through one of the blades of the propeller;

Figure 4 is a longitudinal sectional view through the control mechanism;

Figure 5 is a side elevation of oneV of the blades. of the propeller partially shown in section;

Figures 6 and 7 are views of the coacting faces of the sections of the propeller hub.

Referring now more particularl to the drawings, the numeral 10 general y designates a propeller shaft of an engine 11. At its forward end, this propeller shaft is provided with the usual flange 12 fory securing thereto the hub 13 of the aeroplane propeller. In accordance with my invention,

- the hub 13 is formed in two `sections 14 and 15 which' are held in assembled relation by the bolts 16 employed forl attaching the hub to the ange 12. These sections have grooves in their coacting faces which, in the Aassembled relation of the sections, produce radiallyI 'directed sockets 17, the purpose of which, will .presently appear.

blade of" the propeller is with two complementary rim secvnsflSlforming a frame for the blade grog- ,'fas"indieated at 19, the edges of the la e into the groeves 20 formed in the inf.

ner faces of the rim sections. At the inner ends of each rim section'an extension 21 is provided, these extensions 2l combining to lroduce a circular or shaft-like section-and eing secured together by bolts :22, both lthe heads and nuts of which are flush-seated in the surfaces of the sections. The shaft-like section thus produced is then covered by a bearing 23 which fits into the socket 17 `of the hu At their outer ends, the rim sections are provided with similar -extensions24 which arelikewise surrounded by a bearing 25.

These bearings fit into radial sockets 26 formed in the inner face of a rim 27 rim. 27 is rigidly secured to the hub 13 by Ine-ans of spokes 28 which may be employed in any desired number, two being illustrated in the present instance. These spokes are preferably shaped in cross section, after the manner of 'shaping a propeller blade, in order that instead of interfering during operation of the propeller, they\will, in fact, increase the thrust produced thereby.

About the shaft 10, rearwardly of the flange 12, a ring 29 is rdisposedp The forward face of this ring is provided with ball sockets 30 corresponding in number to the ropeller blades. Each propeller blade is urther attached to its rim portion by a plurality of transversely extending bands 31 arranged in pairs at opposite faces of the blade and bolted together through the blade. One of these airs of bands of each blade is provided wity an extension 32 projecting rearwardly toward the collar 29 and having at its rear end a ball 33 for engagement in the correspondin" socket 3() ofthe ring. It will be obvious t at as the ring 29 is shifted toward or awa. from the hub 13, the propeller blades wlll be rotated about their pivlots to change the pitch thereof and accordingly to increase or decrease the thrust of the pro ellen f..

e periphery of the ring 29 is provided with a substantiall VA-shaped groove for the reception of a shi ting ring 34, the face of the groove, due to the high speed of operation of aero lane engines, being preferably sheathed wit bearing material, as indicated at 35. The rin 34 is formed in two sections and thevbo ts 36 employed for connect- This ing these sections provide means for attachl of the. engine converge, as at 39, and are there secured to the forward end of a rack 40. This rack is longitudinally shiftable in guides 41 carried by a suitable supportlng frame 42. This supporting frame likewise provides a mounting for a spider 43 upon which is rotatably mounted a disk 44, the periphery ofwhich is provided with gear teeth 45 and the 'face of which operates against the toothed'face of the rack 40 and is formed with a spiral rib 46 for coaction with the teeth of the rack. The spider 43 likewise provides amounting for a .trunnion 47 of a pinion` 48, the teeth of which mesh with the teeth 45 upon the periphery of the disk 44. This trunnion is provided 'with a suitable'operating crank 49 or may' be rotated in any desired manner.

It will be obvious that upon rotation of the pinion 48, the disk will be rotated and the rack 40 shifted longitudinally in a direction, de nding upon the direction of rotation of t e inion 48. Y The connections between the rac 40 and ring 34'will cause the ring 29 to be'shifted toward or away fromJ the pro eller and will accordingly4 change the pitc of the blades. It will be obvious that the connection betweenthe disk 44 and the rack will hold the rack locked against longitudinal movement in any position thereof and thus provide a means for resisting the tendency of the propeller blades to assu-me a position in which there is no thrust thereon.

Since the construction hereinbefore set forth is obviously capable of a certain range of change and modification without materially de arting from the spirit of the invention, do not limit myself to such specific structure except as hereinafter claimed. AI claim 1. In apropeller, the cpmbination' with a driven shaft, a hub secured thereto a rim surrounding the hub in spaced relationv thereto and rigidly connected therewith, radially direc-ted blades having their inner ends rotatably mounted in the hubA and their outer ends rotatably mounted in the rim, means longitudinallyv adjustable upon and rotatable with relation to the shaft and connected with said blades for rotating the blades about the pivots thereof, said means comprising a ring surrounding the shaft' and having in its periphery a groove, a second ring slidably engaged in the groove and held against rotation with relation to the first named ring, a rack connected with the sec ond ring,a disk confronting the toothed fac of the rack. and having a spiral rib for coaction ywith 4the teeth of the rack and means for rotating said disk.

2. In'eombination with a propeller including radially extending blades mounted for 'rotation about the axes thereof, a shaft up'on which the propeller is mounted, a ring loosely surrounding said shaft and` means for*v longitudinally shifting said ring upon the shaft including a -rack having connection y withl the ring permitting rotation of the ring, adisk confronting th toothed face of the rack and having a spira rib for coaction with the teeth of the rack and means for rotatin said disk.

driven shaft, a hub securedthereto. and radially projecting blades carried by the hub and rotatable about their axes'u on the hub and means for rotating said blades comprising arms rigidly securedto said blades'and provided at their free ends with 4s herical heads, a ring loosely surrounding t e shaft and having sockets for the f reception of the l l .3. n a propeller, the' combination with a heads and means for shifting the ring lngiy tudinally of the shaft permitting rotation ofthe ring. t v

In testimony whereof I hereunto atlix my signature. HARMON G. STANTON.A 

